I placed some rubbery shelf liner on top of some short bookcases and set my wooden thread racks on it. I then took a clear plastic bag that came from the dry cleaners, cut it open so it is one large "sheet" of plastic and secured one long side behind the top of the thread racks. The plastic hangs over and down the front of the thread. I can easily see what color of threads I have and they are kept dust free. (I have 3 or 4 of the thread racks all set along the tops of the bookcases and covered with the plastic)